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I am stuck with my app, as I am unable to debug as it is a multithreaded one and crashes with error SIGSEGV. I get lot of information from LogCat, which gives me addresses in my native library. It would be helpful if I could convert these addresses into my code.

Does anybody have any idea how to use addr2line, which is provided with android-ndk?

Tuti
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NoAIUser
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2 Answers2

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Let's say that logcat show you the following crash log (this is from one of my projects):

I/DEBUG   (   31): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
I/DEBUG   (   31): Build fingerprint: 'generic/sdk/generic:2.3/GRH55/79397:eng/test-keys'
I/DEBUG   (   31): pid: 378, tid: 386  >>> com.example.gltest <<<
I/DEBUG   (   31): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000000
I/DEBUG   (   31):  r0 001dbdc0  r1 00000001  r2 00000000  r3 00000000
I/DEBUG   (   31):  r4 00000000  r5 40a40000  r6 4051a480  r7 42ddbee8
I/DEBUG   (   31):  r8 43661b24  r9 42ddbed0  10 42ddbebc  fp 41e462d8
I/DEBUG   (   31):  ip 00000001  sp 436619d0  lr 83a12f5d  pc 8383deb4  cpsr 20000010
I/DEBUG   (   31):          #00  pc 0003deb4  /data/data/com.example.gltest/lib/libnativemaprender.so
I/DEBUG   (   31):          #01  pc 00039b76  /data/data/com.example.gltest/lib/libnativemaprender.so
I/DEBUG   (   31):          #02  pc 00017d34  /system/lib/libdvm.so

Look at the last 3 lines; this is your callstack. 'pc' is the program counter, and the pc for stack frame #00 gives you the address where the crash occurred. This is the number to pass to addr2line.

I'm using NDK r5, so the executable I'm using is located at $NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin; make sure that is in your $PATH. The command to use looks like

arm-linux-androideabi-addr2line -C -f -e obj/local/armeabi/libXXX.so <address>

Or, for the case above:

arm-linux-androideabi-addr2line -C -f -e obj/local/armeabi/libnativemaprender.so 0003deb4

Which gives you the location of the crash.

Note:

  • The -C flag is to demangle C++ code
  • Use the .so file under obj/local/armeabi, since this is the non-stripped version

Also, when using NDK r5 with a 2.3 AVD, it is actually possible to debug multithreaded code.

svdree
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    Great, Excellent. Thanks for the detailed answer. It worked for me 100%. Thank you and an up vote for you. – NoAIUser Mar 15 '11 at 20:58
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    Brilliant, got this working thanks to you - I was struggling using the `.so` file in `libs`, which of course is stripped. The one in `obj` works. – Nick Jul 18 '11 at 18:17
  • avdree - I'd encourage you to show the actual output of add2line in this otherwise very good answer. – Chris Markle Jul 27 '11 at 21:01
  • Just a comment, the addr2line utility can be used with any (GNU-produced?) binary containing debug symbols. Works for the desktop and embedded targets as well :) – Morten Jensen Jun 26 '12 at 08:20
  • I am not using any native library except `android-support-v4`.. So is it possible that i can use `addr2line` tool to get line number of crash in java file.. i have added details at [http://stackoverflow.com/q/30093772/1994950].. – Kushal May 07 '15 at 07:25
  • My project logs says #00 pc 0025e520 [heap] #01 pc 0002230f /system/lib/libbinder.so (android::Parcel::freeDataNoInit()+22) #02 pc 00022371 /system/lib/libbinder.so (android::Parcel::~Parcel()+4) what adress I suppose to provide for these system/libs file like obj/local/armeabi/libnativemaprender.so – Mahendra Chhimwal Jul 08 '16 at 04:29
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    I wanted to move your attention on the second note: **Use the .so file under obj/local/**. Lifesaver – fillobotto Mar 03 '17 at 14:06
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    arm-linux-androideabi-addr2line: 'obj/local/armeabi/libart.so': No such file why? – Angelina Jan 23 '19 at 14:41
  • @MahendraChhimwal '0025e520' would be the address you would use in your comment above, or '00022371' – Jeffrey Holmes Feb 24 '23 at 10:31
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There's an easier way to do this now (ndk-r7). Check out the ndk-stack command. The docs are in you_android_ndk_path/docs/NDK-STACK.html

Byron
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